Optical fiber gas sensors with ultra-sensitivity and dynamic range (Conference Presentation)

2020 ◽  
Author(s):  
Wei Jin
Keyword(s):  
Optical Fiber ◽  
Gas Sensors ◽  
Dynamic Range

scholarly journals In-Process Diameter Measurement Technique for Micro-Optical Fiber with Standing Wave Illumination

2021 ◽  
Author(s):  
Masaki Michihata ◽  
Zhao Zheng ◽  
Daiki Funaiwa ◽  
Sojiro Murakami ◽  
Shotaro Kadoya ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Standing Wave ◽  
Dynamic Range ◽  
Scattered Light ◽  
High Dynamic Range ◽  
Measurement Range ◽  
Diameter Distribution ◽  
Process Measurement ◽  
Air Turbulence ◽  
Tapered Optical Fiber

AbstractIn this paper, we propose an in-process measurement method of the diameter of micro-optical fiber such as a tapered optical fiber. The proposed technique is based on analyzing optically scattered light generated by standing wave illumination. The proposed method is significant in that it requires an only limited measurement range and does not require a high dynamic range sensor. These properties are suitable for in-process measurement. This experiment verified that the proposed method could measure a fiber diameter as stable as ± 0.01 μm under an air turbulence environment. As a result of comparing the measured diameter distribution with those by scanning electron microscopy, it was confirmed that the proposed method has a measurement accuracy better than several hundred nanometers.

scholarly journals Distributed Fiber Optical Technology for Damage Identification of Engineering Structure

2018 ◽  
Vol 14 (06) ◽  
pp. 17
Author(s):  
Xiaoma Dong ◽  
Liqiang Zhou
Keyword(s):  
Optical Fiber ◽  
Model Test ◽  
Damage Identification ◽  
Dynamic Range ◽  
Optical Loss ◽  
Rock Foundation ◽  
Rock Slide ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Interface Slip

<p class="0abstract"><span lang="EN-US">To conduct optical fiber monitoring rock slide model test and optical fiber monitoring of steel concrete interface slip model test, the large triaxial shear test of geotechnical engineering </span><span lang="EN-US">wa</span><span lang="EN-US">s used. First, the data of sliding distance and optical loss and their dynamic range </span><span lang="EN-US">we</span><span lang="EN-US">re obtained. Second, the slide distance and fiber loss relation curve and the fitting equation </span><span lang="EN-US">we</span><span lang="EN-US">re worked out. Finally, the typical applications of optical fiber sensing technology in Rock Engineering (high slope engineering, rock foundation of Dam Engineering) slope stability and geological disaster monitoring </span><span lang="EN-US">we</span><span lang="EN-US">re put forward.</span><span lang="EN-US">The results showed that optical fiber sensing was very sensitive, and the loss value was 30 to 50dB. The dynamic range of rock slide monitoring fiber was 3 to 3.5mm, and the dynamic range of the interface slip monitoring fiber was 1.6mm. Thus, the sensing system can detect the sliding process of the interface between the concrete and the steel plate. It provides some reference for the sliding monitoring of the composite materials.</span></p>

scholarly journals Fiber Optic Attenuator

2021 ◽  
Vol 2086 (1) ◽  
pp. 012128
Author(s):  
D P Andreev ◽  
E I Andreeva
Keyword(s):  
Optical Fiber ◽  
Spectral Dependence ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Wide Range ◽  
Bending Losses ◽  
Type Fiber

Abstract A study of a bending-type fiber-optic attenuator has been carried out. It is shown that the use of G.655 - optical fiber provides the largest dynamic range of the attenuator. The spectral dependence of the bending losses was measured in a wide range of wavelengths: from 1270 to 1610 nm.

scholarly journals Doubly resonant sub-ppt photoacoustic gas detection with eight decades dynamic range

2021 ◽  
Author(s):  
Zhen Wang ◽  
Hui Zhang ◽  
Qiang Wang ◽  
Simone Borri ◽  
Iacopo Galli ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Near Infrared ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Fast Response ◽  
Wide Dynamic Range ◽  
Acoustic Resonators ◽  
Light Waves ◽  
Energy Environment ◽  
Small Footprint

Abstract Gas sensors with high sensitivity, wide dynamic range, high selectivity, fast response, and small footprint are desirable across a broad range of applications in energy, environment, safety, and public health. However, designing a compact gas sensor with ultra-high sensitivity and ultra-wide dynamic range remains a challenge. Laser-based photoacoustic spectroscopy (PAS) is a promising candidate to fill this gap. Herein, we report a novel method to simultaneously enhance the acoustic and light waves for PAS using integrated optical and acoustic resonators. This increases sensitivity by more than two orders of magnitude and extends the dynamic range by more than three orders of magnitude, compared with the state-of-the-art photoacoustic gas sensors. We demonstrate the concept by exploiting a near-infrared absorption line of acetylene (C2H2) at 1531.59 nm, achieving a detection limit of 0.5 parts-per-trillion (ppt), a noise equivalent absorption (NEA) of 5.7×10-13 cm-1 and a linear dynamic range of eight orders of magnitude. This study enables the realization of compact ultra-sensitive and ultra-wide-dynamic-range gas sensors in a number of different fields.

scholarly journals Analysis and Design of a Hybrid Optical Fiber Refractometer for Large Dynamic Range Measurements

2020 ◽  
Vol 20 (10) ◽  
pp. 5260-5269
Author(s):  
Haris Apriyanto ◽  
Olivier D. Bernal ◽  
Michel Cattoen ◽  
Francoise Lizion ◽  
James H. Sharp ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Dynamic Range ◽  
Large Dynamic Range ◽  
Range Measurements ◽  
Analysis And Design

scholarly journals Pd-loaded SnO2 hierarchical nanospheres for a high dynamic range H2S micro sensor

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 5987-5994 ◽  
Author(s):  
Yue Su ◽  
Peng Chen ◽  
Pengjian Wang ◽  
Jing Ge ◽  
Shi Hu ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Gas Detection ◽  
Micro Sensor ◽  
High Dynamic

The sensitivity of Pd-loaded SnO2 nanosphere sensor to H2S gas: micro gas sensors based on Pd-loaded SnO2 nanospheres have credible gas detection abilities down to 10 ppb and 4 orders of magnitude concentration detection ranges.

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